Liquid door-check.



L. G. NORTON.

LIQUID DOOR CHECK. APPLICATION rum) JUNE 23,1913.

1 ,1 17,693, Patented Nov. 17, 1914 Z(/ (L/ LOSS c: s .1511] 65/1560 '1? J. M, LM M @4 mm M T9 HWWL MWWJ STATEt-i PATENT fllli lilltlitl.

. C. NGRTON, O33 CHICAGO, ILLINOIS, ASSlG-NOB TO NORTON D8033. CHECK 00., CI GEICAGO, ILLINOIS, A CORPORATION OF WEST VIRGINIA.

LIQUID noon-canon Specification 01 Letters Patent.

Patent-ed Nov. 1?, 3914:.

Application filed June 23, 1913. Serial No. 775,343.

To aZZ whom it may concern:

Be it known that I, LEWIS C. NORTON, a citizen of the United States, residing at Chicage, county of Cook, State of Illinois, have invented an Improvement in Liquid Door- Checks. of which the following descri tion, in connection with the accompanying rawing, is a specification. like characters on the drawing representing like parts.

This invention relates to liquid door checks and has for its object to provide a liquid door check with novel means for preventing the liquid in the liquid-containing chamber from working up along the shaft which is operatively connected to the piston.

The invention may be applied to a liquid door check which is provided with a spring for automatically closing the door or may be applied to a door check which does not have the spring associated therewith. These liquid door checks are usually made with a liquid-containing chamber in which the piston operates and the piston has connected thereto a shaft whichextends through one wall of the chamber and is operatively connected to the door or the door frame, as the case may be. A. packing gland is usually provided in the wall of the chamber through which the shaft extends, said gland carrying suitable packing which has for its object to prevent liquid from leaking out of the cylinder along the shaft. l have found from experience that the ordinary packing which is used for this purpose is not always effective in preventing the escape of liquid from the chamber along the shaft and the purpose of the present invention is to provide an improved construction which will prevent the liquid from working up along the shaft into the packing gland. I

In order to give an understanding of the invention I have chosen to illustrate it as it would be embodied in a liquid door check having a spring associated therewith for closing the door, but I wish it understood that the invention is not confined to this particular type of door check, and that the drawings show a selected embodiment of the invention only.

The figure in the drawing is a vertical sectional view through a liquid door check embodying my invention.

1 designates the casing of t e door check which is providedwith the liquid-containin g chamber 2 which is filled with some suitable liquid such as glycerin and in which operates the piston 3, said casing having the usual ports and valves controlling them by which the operation of the piston is regulated. The piston 3 has operatively connected there to a shaft 6 which extends through one wall of the chamber 2 and which has connected thereto an arm that in turn is secured to the door or door casing in usual manner. In the construction herein shown the connection between the piston and the shaft is in the form of a pinion 30 on the shaft meshing with the rack 31 on the piston. The casing is provided with a spring-receiving chamber 7 in which is received a spring 8 that is con nected at one end to the shaft 6 and at the other end to the casing i, said spring operatmg to close the door as usual in devices of this nature. separated by a partition 9 which carries a packing gland 10, of usual construction through which the shaft (3 extends, said packing gland being formed with the recess or chamber 11. in which the packing 12 is received.

The parts thus far described are such as are usually found in liquid door checks and form no part of my present invention. .\lthough this parking 1''. is designed to prevent the liquid in the chamber 2 from Working up along the shaft (3. yet I find that it is not always effective for this purpose and that sonuitiiues, either because it becomes hard or for some other reason. it will not prevent the liquid from working through the packing gland and thus escaping from the chamber When this happens the check does not operate correctly and it becomes necessary to refill the chamber 2.

In order to prevent any possibility of the liquid in the chamber 2 from working up along the shaft. l have pr vided a novel construction which comprises a shoulder formed on the shaft 3 and situated within the chamber '2 and adapted to engage the lower end of the packng gland and means fdr yieldingly holding this shoulder against the packing gland to make a tight seat. In

.the embodiment, of the invention herein shown, this shoulder is formed by a washer 3 which is fast on the shaft 6 and which. will preferably be made of fiber or raw hide or of some other similar material although I do not wish to be confined to any particular material, as it is within my invention to make said washer of any suitable material. This washer engages the lower end 14:

e of the packing gland which projects into the the end 14- of the packing gland.

chamber 2 somewhat, said lower end being preferably formed with a fiat surface to ave a flatbearingiagainst the washer 13.

' The washer 13 constitutes in etl'ect ashoulsomewhat from the shaft.

Means are provided for yicldingly holding the Washer 13 against the surface 14 and the construction which I have herein illustrated for this purpose comprises a spring 16 which encircles the shaft 6 and bears at one end against a collar or washer 17 on said shaft and at the other end against the packing washer 18 which is received within the chamber 11 and rests on the packing 12. As herein shot a the collar 17 is held in position by a pin 19 extending through the shaft 6. If desired the collar 17 might be "omitted and the s rin 16 made to bear l" is directly against the in 19, or any appropriate construction might be adopted which would form a suitable abutment for the spring to engage against. As shown, the spring presses d wnwardly on the packing Washer 18 and thus. serves to keep the packing 12 tightly pressed about the shaft (5 and also presses upwardly against the pin 19 and thus tends to lift the shaft 6 upwardly. This lifting tendency results in holding the washer 13 yieldingly against the surface 1% slides the washer is made to fit the surface accuratelythe yielding pressure between the' Washer and packing gland provides a tight joint, which Will prevent the passage ot \Vhile I have illustrated one embodiment of my invention I do not wish to be limited to the constructional features shown.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is Ina liquid door check, the combination with a casing having a liquid-receiving chamber and a spring-receiving chamber separated by a partition, ofa packing gland sustained by the partition, a piston in the liquid-receiving chamber, a spring in the spring-receiving chamber, a shaft extending through the packing gland and operatively connecting the pistonand spring, a washer on the shaftin the lit uid-recciving chamber and engaging and fitting the end of the packing gland, a collar on the shaft in the spring-receiving chamber, and a spring interposed betweensaid collar and the packing gland whereby the washer is yieldingly held against the end of the packing gland and a liquid-tight joint is provided. Y

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

LEWIS C. NORTON. VVitnesws:

E. M. CLARK, E. E. CHms'rmNsoN. 

